Piston-mold-making device.



c. s. ANDERSON.

PISTON MOLD MAKING DEVICE.

APPLICATION FILED MAR. I6, 1916.

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C. S. ANDERSON.

PISTON MOLD MAKING DEVICE. APPLICATION FILED MAR. is. 1915.

Patented Apr. 16, 19 18. 2 SHEETS-:SHEET 2.

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nrarrnn snares 'M N Q CHARLES SEIGFRIED ANDERSON, OF MINNEAPOLIS, IVIINNESGTA, .ASSIGNOR OF ONE FOUBTH TO FREDERICK J. KNQER, OF MINNEAPOLIS, MINNESOTA.

PISTON-MOLD-IVIAKING- DEVICE.

Specification of Letters Patent.

Patented Apr. it), 1918..

Application filed March 16, 1916. Serial No. 852,601.

To all whom it may concern: 7 Be it known that I, CHARLES SEIGFRIED ANDERSON, citizen of the United States, residing at Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Piston-Mold-Making Devices; and I do hereby declare the following to be a full, clear, and eXact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. a My invention has for its object to provide an improved molding apparatus especially adapted for casting pistons; and to such ends, generally stated, the invention consists of the novel devices and combinations of devices hereinafter described and defined in the claims.

The special object of the invention is to provide a piston-mold making device which is serviceable for forming molds used in the casting of pistons for internal combustion engines, such as is used in automobiles and auto-trucks. The pistons of engines of the above character, as now found in the market, vary in diameter from two and three-fourth to five inches, the variations being usually but one-fourth inch but sometimes but one-eighth of an lnch. Plstons of the same diameter vary greatly in length and they also vary in respect to the diameter and location of their wrist pin bosses.

My invention provides a device for making molds whereby pistons of a given diameter may be cast in all of their varying different lengths, and also provides for the desired variation in the location and diameter of the wrist pin boss in the different lengths of pistons.

This is accomplished by providing a pis ton mold pattern that is adjustable as to length and by providing a piston mold core box that is also adjustable in length and is provided with interchangeable or detachable and adjustable wrist pin boss patterns. By the use of such a device, in practice I have found that by my invention I not only very greatly decrease the cost of casting pistons, especially for repair work, but make it possible at very short notice and without requiring the making of wooden patterns, to cast the pistons in the various different lengths, as may be required. Of course, for pistons of different diameters, difi'erent pat tern sections must be provided but even in this instance, a good many of the parts used are interchangeable or usable with the sections for casting pistons of different diameters.

In the accompanying drawings which illustrate the invention, like characters indicate like parts throughout the several views.

Referring to the drawings:

Figure l is a side elevation showing the piston mold pattern;

Fig. 2 is a vertical section taken centrally through the same; 7

Fig.3 is a'horizontal section taken on the line at m of Fig. 2;

Fig. 4 is a plan view of the mold core box, some parts being sectioned and some parts being broken away;

Fig. 5 is a section taken on of Fig. l; and

Fig. 6 is a section taken on the line w a? of Fig. 4:-

Referring first to the piston pattern shown in Figs. 1, 2 and 3, the numeral 1 indicates the core print of the pattern and the numerals 2, 3 and i indicate the central pattern sections for forming that portion of the mold which forms the exterior surface of the piston. The sections 2 and 3 have solid heads at their ends and these heads are formed with axial hubs 2 anc 3, respectively. The intermediate section 4 has a hub 4* connected to the cylindrical shell by radial-spokese- A bolt 5 is passed through the core print 1 and the hub 2 of the section 2 and into the hub 3 of the section 3 and its threaded end is engaged with a sleeve-like nut 6 rotatably mounted in the hub 3 and provided at its outer end with a shoulder that clamps the head of the said section 3, thereby locking the several sections 2, 3 and 4: together in axial alinement and with their cylindrical outer; surfaces forming a continuous cylinder. The core print 1 projects very considerably radially outward of the cylindiical surface of the sections 2, 3 and l, and may be used in connection with cylinder-forming sections that vary considerably in diameter. Obviously, the length of the cylinder may be varied by varying the width of. the intermediate section i. In forming the cavity in the sand, the pattern is set with its axis vertical and with the print 1 on top, and with the upper the line m m surface of the print on the parting of the flask. The said print 1 will leave a cavity for the reception of the anchoring flange of the core to be hereinafter described.

The device for forming the piston core is illustrated in Figs. 4, 5 and 6, and, as shown, it is made to form only one-half section'oi the core. Otherwise stated, the coreforming sections are semi-cylindrical, and in the use thereof, two half cores will be made andthese two half cores will be stuck together to make a complete core. When it is desired to make a complete core in one operation, two of the devices shown may be puttogether, but in this instance, the core box will be set with its axis vertical and the top head plate, hereinafter described, will not be required.

Describing the core box, as shown, the numerals 7 and 8 indicate so-called head plates. The numeral 8 indicates a semicylindrical section for forming the core print anchoring flange which is adapted to fit the seat made by the core print 1 of the pattern illustrated in Figs. 1, 2 and 3. The numerals 9, 10 and 11 indicate semi-cylindrical sections for forming the body of the core print. These sections 9, 10 and 11 are preferably formed with internal ribs for producing corresponding depressions in the sand whereby reinforcing ribs are produced n the interior of the piston. The wrist pin boss patterns 12 are detachably and adjustably secured to the section 10 by means of screws 13 which work through slots 14: in the said section 10. The said boss patterns 12 are provided with projecting ribs that overlap the section 11. T he said sections 9, '10 and 11 may be made in difierent widths, and the wrist pin boss patterns 12 may be attached to the sections 10 that vary in width, and furthermore, in the arrangement illustrated, are capable of limited adjustment in respect to the said section 10. The

said sections 9, 10 and 11 are provided with "outwardly projected lugs 15 and clamping bolts 16 are'passed through the head plate 8 and through the several alined lugs 15 and are screwed into long sleeve-like nuts 17'that are passed through the head 7 and section 8 and are provided at their outer ends with shoulders counter-sunlrinto said head plate.

. As is evident, by providing sections 9, 10 and '11 that vary the width, the cores for pistons of different length may be made. The distance between the inner faces of the head plates 7 and 8" should be, say onefourth of an inch more space than the distance between the inner face of the core print'l and the face of the head of the section 3 of the cylinder pattern, so as to provide, in the sand, a space for forming the "head of the piston. Obviously, when a core made in the core box described, is placed within the cavity made bythe piston pattern and with the anchoring flange of the core seated in the impression made .by the core print 1, the exact cavity required for casting the piston is formed in the mold. Preferably, all'of the parts, both of the pattern and of the core box, are made of metal, thereby ln'surmg greater accuracy. In practice, I have found that by the use of the above device, pistons having very thin and accurately formed walls may be made, all without requiring any great skill in the workman.

In the device described, the head plates, clamping bolts and wrist pin lug patterns may be used with sections 9, l0 and 11 of.

different diameter, and even the section 8 may be used where the variation in diameter is not great. Very great economy in patterns required in making various different sizes of pistons is therefore effected by the use of this device.

What I claim is:

1. A piston mold making'device comprising a sectional longitudinally extensible and contractible piston pattern and a sectional wallof the piston is formed, the said pattern having a core print at one end and the said core box having a flange forming section forformi-ng on the core an anchoring flange to fit the impression made by-the core print of said pattern.

3. A-core box made up of a plurality of sections arranged to be put together in different ways to 'form'cores for pistons of different lengths, means for'detachably holding the'said sections together, and wrist pin patterns detachably secured to the interior of certain of the saidsections. p 4. A core box made up of aiplurality of sections arranged to be put together different ways to form cores for pistons of different lengths, head plates applied tothe ends of the outer sections, and means for detac hably holding said headplates and sections'together. v

5. A core box made up of end and inter -'mediate sections arranged tobeput. together in different ways to form cores for pistons "ofrdifferent lengths, wrist pin patterns detachably secured to oneof the intermediate sections, head plates applied to the outer ends of the outer sections, and means for detachably connecting said sections and head plates.

6. Molding apparatus for pistonmold making comprising a pair of end sections, a multiplicity of central sections each of different character, and means for interchangeably connecting any of said central sections in position between said end sections, said connecting means being adjustable to fit any length of central section.

7. Molding apparatus for piston-mold making comprising a plurality of sections, some of said sections being of fixed character and some of differing character, means for connecting the sections of fixed character interchangeably With a section of differing character, Wrist pin boss patterns, and means for adjustably connecting said boss patterns With the sections of variable character.

8. Molding apparatus for piston-mold making comprising a pair of complemental mold-forming members each consisting ofa pair of end sections of fixed length and an intermediate section, at least one of said end sections being of a different length from the corresponding section of the other member, the intermediate sections beingof the same length, and means for interchangeably holding said intermediate and end sections in position in each member whereby the intermediate sections may be changed to Vary, at will, the length of piston to be formed in the molds made in said apparatus,

In testimony whereof I aiiix my signature in presence of two Witnesses.

CHARLES SEIGFRIED ANDERSON. l/Vitnesses:

B. G. WHEELER, CLARA DEMAREST.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Eatenta, Washington, D. 0. 

